【摘要】：穩(wěn)態(tài)情況下,一般認(rèn)為三次諧波具有零序分量特征,無(wú)法耦合至主變壓器三角形側(cè)設(shè)備,但經(jīng)現(xiàn)場(chǎng)試驗(yàn)所得結(jié)論可知,和應(yīng)涌流造成的不平衡三次諧波卻可以流入主變壓器低壓側(cè),并與低壓側(cè)電容器組構(gòu)成回路,有可能使電容器及避雷器損壞。系統(tǒng)穩(wěn)態(tài)運(yùn)行時(shí),三次諧波僅僅存在零序分量;而和應(yīng)涌流中的三次諧波電壓、電流并不完全對(duì)稱,存在三次諧波的正、負(fù)、零序分量,故涌流時(shí)的三次諧波的正序、負(fù)序分量能流出變壓器的三角形側(cè),流入電容器組和負(fù)荷。同時(shí),如果并聯(lián)電容器組的電抗率為6%,則存在三次諧波串聯(lián)諧振點(diǎn),這是導(dǎo)致三次諧波進(jìn)一步放大的原因。文中通過(guò)理論及仿真分析,論述了上述觀點(diǎn)的正確性,并通過(guò)計(jì)算,設(shè)計(jì)出一種配置混合串聯(lián)電抗器的并聯(lián)電容器組。動(dòng)模試驗(yàn)證明,配置混合串聯(lián)電抗器的并聯(lián)電容器組可以大大抑制系統(tǒng)側(cè)及電容器支路中的三次及五次諧波,較配置統(tǒng)一串聯(lián)電抗器的并聯(lián)電容器組具有較大優(yōu)勢(shì)。
[Abstract]:In the steady state, it is generally considered that the third harmonic has the characteristics of zero sequence components and can not be coupled to the triangular side equipment of the main transformer. However, the field test results show that the third harmonic has the characteristics of zero sequence components. The unbalanced third harmonic caused by the inrush current can flow into the low-voltage side of the main transformer and form a circuit with the low-voltage side capacitor bank, which may damage the capacitor and arrester. When the system is in steady state, the third harmonic only has zero sequence component, and the third harmonic voltage in the inrush current is not completely symmetrical, and there exists the positive, negative and zero sequence components of the third harmonic, therefore, the positive order of the third harmonic in the inrush current. The negative sequence component flows out of the triangular side of the transformer into the capacitor bank and load. At the same time, if the reactance of the shunt capacitor bank is 6, there is the third harmonic series resonance point, which is the reason for further amplification of the third harmonic. Through theoretical and simulation analysis, this paper discusses the correctness of the above viewpoint, and designs a shunt capacitor bank with hybrid series reactor by calculation. The dynamic simulation tests show that the shunt capacitor banks with hybrid series reactors can greatly suppress the third and fifth harmonics in the system side and capacitor branches, which is superior to the shunt capacitor banks with unified series reactors.
【作者單位】： 國(guó)網(wǎng)江蘇省電力公司電力科學(xué)研究院;東南大學(xué)電氣工程學(xué)院;國(guó)網(wǎng)江蘇省電力公司;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(50977012,51377022) 江蘇省自然科學(xué)基金資助項(xiàng)目(BK20140113)~~
【分類號(hào)】：TM407

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本文編號(hào)：2221929